import java.io.IOException;
public class testcode{

static int a=0;
	public static void main(String[] args) throws IOException {
java.util.Scanner sc = new java.util.Scanner(System.in);

	a = sc.nextInt();
	if 	(a % 2 ==  0)
	{
		System.out.print("yes");
	}
	else
	{
	System.out.print("no");
	}
	System.in.read();
}
}